Hi Raymond,
On Fri, Dec 22, 2023 at 9:31 PM Raymond Mao <raymond....@linaro.org> wrote:
>
> Save boot arguments r[0-3] into an array for handover of bloblist from
> previous boot stage.
>
> Signed-off-by: Raymond Mao <raymond....@linaro.org>
> ---
> Changes in v2
> - New patch file created for v2.
> Changes in v3
> - Swap value of r0 with r2.
>
> arch/arm/cpu/armv7/start.S | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S
> index 69e281b086..2ca63ca32c 100644
> --- a/arch/arm/cpu/armv7/start.S
> +++ b/arch/arm/cpu/armv7/start.S
> @@ -152,9 +152,22 @@ ENDPROC(c_runtime_cpu_setup)
> *
> *************************************************************************/
> WEAK(save_boot_params)
> +#if (IS_ENABLED(CONFIG_OF_BOARD) && IS_ENABLED(CONFIG_BLOBLIST))
> + ldr r12, =saved_args
> + /* Intentionally swapping r0 with r2 */
> + stm r12, {r2, r1, r0, r3}
I thought the instruction was a bitmap, so what does the 'swapping'
actually change?
> +#endif
> b save_boot_params_ret @ back to my caller
> ENDPROC(save_boot_params)
>
> +.section .data
> +.global saved_args
> +saved_args:
> + .rept 4
> + .word 0
> + .endr
> +END(saved_args)
> +
> #ifdef CONFIG_ARMV7_LPAE
> WEAK(switch_to_hypervisor)
> b switch_to_hypervisor_ret
> --
> 2.25.1
>
Regards,
Simon
